Mounties say the arrests took place at the Gitdumt'en checkpoint and that 14 people were taken into custody.
Posts from protesters show multiple officers in the area and protesters holding up feathers.
Police have set up an "exclusionary zone" to prevent access to the area - and have told those trying to access the roads they face arrest if they attempt to enter.
RCMP say those arrested are still being processed. "We would like to clarify that both of these allegations are incorrect". "The area is extremely remote and even police had limited access to communication".
The police said they will be enforcing a court order that prohibits people from blocking access to a LNG pipeline construction site.
Other events are being planned for as far away as NY, and even Italy, according to social media.
Shelagh Bell-Irving attended the protest in support of the First Nation blockade.
When community members began digging in, Mounties started amassing nearby.
Coastal GasLink says it has signed agreements with all First Nations along the route but demonstrators say Wet'suwet'en house chiefs, who are hereditary rather than elected, have not given consent. "We haven't had positive experiences with RCMP and police forces".
"In this government, you have a partner willing to figure out the path forward that is right for each of you, and eventually right for every Indigenous person in this country", Trudeau told the Indigenous leaders who had moved to the new venue with him.
Protests in B.C. over the Coastal GasLink pipeline have highlighted the differences - and potential conflicts - between elected band councils and hereditary leaders over resource development and land use.
"The RCMP's actions yesterday crossed a serious line", Hassan said.
In response to the RCMP's statement, Tait refers back to history. "What the rule of law means is not sending in the police".
Those in attendance voiced their opposition to the events in B.C. and performed traditional Indigenous rituals such as smudging, a ceremony that involves the burning of sacred herbs.
The pipeline by TransCanada subsidiary Coastal GasLink would carry natural gas from the Dawson Creek area to Kitimat.
While Phillip appreciates the situation is a hard one to navigate, he has stressed that "force is not the solution".
Members of the Wet'suwet'en First Nation had established two camps along the forest service road with fortified checkpoints: Gidimt'en and Unist'ot'en. The Delgamuukw case set a precedent that the Wet'suwet'en never extinguished their title and rights.
The UBCIC is calling "upon the Canadian Justice system to uphold the human rights and dignity of Indigenous peoples".
A post on the Wet'suwet'en Access Point Facebook page claimed police broke through the checkpoint gate with "brutal force".
He took no questions from media before reporters were ushered out of the room, on a day that saw dozens of people march past heavy RCMP presence to express their frustration in chants, signs and cries of passion at the building on Sussex.
"It just feels like our government has declared war on my people", Huson says.I mean, it's betrayal, it's greed, it's corruption, it's obscene. "I don't want to dwell on the past, but you know, and I know, that previous governments and institutions spent years ignoring your communities and your concerns", Trudeau said. The court ordered the removal of any obstructions interfering with the Coastal GasLink project.
"The RCMP respects and protects the right to peaceful demonstrations as guaranteed under the Canadian Charter of Rights and Freedoms", it said.
"I think it's my job, I'm the Member of Parliament for this area and there's a very large project proposed", he says. Support for those fighting against the pipeline has grown since the injunction. When the discussions failed, RCMP moved in at around 3 p.m.
"When we have grey areas and uncertainties, that's when the tensions arise and that's where people get frustrated, and I understand that frustration", he added.
More than 200 people crowded the steps of the Halifax Regional Police headquarters on Monday to show their support for a West Coast First Nation whose resistance to a pipeline has captured national headlines.
Meantime, a fundraiser has been launched to help people at the camps buy supplies.